Electrical cowdttctoei



B. BOGNA H.

INSULATING ELECTRICAL CONDUGTORS.

APPLICATION FLLED NOV. I5, 1918.

Patented Dec 23, 1919.

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TNSULA'JLING ELECTRICAL CONDUCTOR.

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Specification of Letters Patent.

Patented nee. 2a, i919.

Application filed November 15, 1918. Serial No. 262,723.

which resists high electric voltage, is hard,

tough and flexible, and which can be'applied conveniently in original application as well as in repairs.

According to this invention, an insulating .coverin is roduced that consists of a plurality of layers, each of which constitutes an insulation in itself and is allowed to set before the next layer is applied. In practising the invention, such insulating material is employed that the usual baking step may be dispensed with, thus cheapening the operation to a considerable extent. This is accomplished by using materials which set within a reasonably short time in the atmosphere.

The drawing represents a section taken through a conductor made in accordance with the invention, the thickness of the layers being exaggerated, no special attempt being made to show proportions.

In carrying out the invention, the electric conductor, forinstance a copper wire, is provided, in any preferred manner, with a coat composed of one hundred parts, by weight, of water, ten parts, by weight, of potassium silicate, to which has been added one part, by weight, of caustic soda. This first coat is employed in its cold state, the caustic soda serving mainly to attack and roughen the surface of the wire, so that the potassium silicate will tightly adhere to the same, and will not be cracked or detached when the wire is bent or otherwise handled.

The potassium silicate forms an insulating 'conductor.

a solution, comprising one hundred parts,.

and glass constitute effective insulation, the

castor oil changing the stifi characteristics of the asphalt and glass into pliability. The powdered glass, on the other hand, practically produces one integral mass of these two layers.

After the second coating has been dried sufficiently, a third coating is applied consisting of acetate of cellulose. This finishing coating enhances the insulating quality of the compound, is waterand fireproof, so as to permit the conductor to be used exteriorly under all atmospheric conditions.

It is to be noted that the proportions mentioned above are merely given by way of example, and that they may be varied according to the requirements. The thickness of the several coatings depends entirely upon the insulating effect and insulating properties needed.

The insulating covering produced in accordance with this invention is durable, and may be employed for a variety of purposes, wherein effective and cheap insulating material is desired. The covering is flexible, does not crack when the wire is being bent or otherwise handled, and hence the wire can be wound into rolls or upon drums,

without affecting the insulating properties of the covering thereon.

lVhat I claim is 1. A metallic conductor having an insulating coating of asphalt into which is incorporated powdered glass and a softening agent, and an interposed coating includmg. foatiiii? to adhere to the metallic conductor. ,1 I metallic conductor having an inulating coating of asphalt into which is 'ncorporated a vitreous material and a toftening agent, and an interposed coating .including potassium silicate for causing /said first coating to adhere to the metallic Signed at New York, in the county of New York, and State of New York, this 8th day of November, A. D. 1918.

BELA BOGNAR.

assium silicate for causing said first too 

